单项选择题

主键之外的全部候选键称为___。

A、辅键
B、替换键
C、符合条件的键
D、以上都不是
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单项选择题
When the adverts came on I got up to put the kettle on.
A. music
B. advertisements
C. paintings
D. graffiti
单项选择题
If you don’t have enough cash, I think you can make arrangement to buy the house
A、on deposit
B、without deposit
C、in credit
D、on credit
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